/Engine/Source/Developer/TextureFormat/Public/Interfaces/ITextureFormat.h
Returns the descriptionfor the single mip level(i.e. no further mips)
[FEncodedTextureDescription](API\Developer\TextureFormat\Interfaces\FEncodedTextureDescription) GetDescriptionForMipLevel ( const [FEncodedTextureExtendedData](API\Developer\TextureFormat\Interfaces\FEncodedTextureExtendedData) * InExtendedData, int32 InMipIndex ) const